ABO	Active Bridge Oscillator	$L_m$	Motional inductance
ACC	Automatic Capacitance Compensation	LPF	Low-Pass Filter
ADC	Analog to Digital Converter	M	Mutual Inductance
$A_e$	Effective Surface Area	MSRF	Motional Series Resonance Frequency
AGC	Automatic Gain Control	N	Odd harmonic overtone (N = 1,3,...)
ALD	Atomic Layer Deposition	NCO	Numeric Control Oscillator
B	Electrical Susceptance	OCXO	Oven-Controlled Crystal Oscillator
BPF	Band-Pass Filter	OTA	Operational Transconductance Amplifier
BVD	Butterworth-Van-Dyke crystal model	PFD	Phase-Frequency Detector
$C_{ext}$	External wiring/parasitic capacitance	PLD	Programmable Logic Device
$C_m$	Motional capacitance	PLL	Phase-Locked Loop
$C_o$	Parallel electrodes capacitance	Q	Crystal’s Quality Factor
$C_o^{*}$	Effective total parallel capacitance	QCM	Quartz Crystal Microbalance
$c_P$	Piezoelectric material elastic constant	$R_{liq}$	Liquid-load damping resistance
D	Crystal’s Dissipation Factor	$R_m$	Motional resistance
DAC	Digital to Analog Converter	$R_s^T$	Total crystal’s series resistance
DDS	Direct Digital Synthesizer	SNR	Signal to Noise Ratio
$f,\omega$	Operating frequency, angular form	t	time
FBAR	Film Bulk Acoustic Resonators	TSM	Thickness Shear Mode
$f_o$	Unloaded crystal resonance frequency	u, V	Voltage
$f_p$	Maximum impedance parallel resonance	VCO	Voltage Controlled Oscillator
$f_r$	Zero-phase series resonance frequency	$X$	Electrical Reactance
$f_s$	Minimum impedance series resonance	Y	Electrical Admittance
G	Electrical Conductance	Z	Electrical Impedance
GCM	$GaP{O}_4$ Crystal Microbalance	$\Delta f_x$	$f_o$ variation, induced by factor x
h	Crystal Electrodes separation	$\tau$	Exponential-Decay time constant
HFF	High-Fundamental Frequency	$\rho$	Density
HPF	High-Pass Filter	${ϵ}_p$	Piezoelectric material permittivity
I	Current	${\mu }_c$	Crystal’s shear modulus
$K_o$	Piezoelectric electrochemical constant	$\eta$	Viscosity
LCM	Langasite Crystal Microbalance	$\alpha$	Oscillator’s Amplifier gain
LEM	Lumped Element Model	$\beta$	Oscillator’s Feedback gain